lineage 3 cards

What replaced RFC 7230–7235?

RFC 9110 (Semantics), 9111 (Caching), and 9112 (HTTP/1.1) — June 2022, all Internet Standards. RFC 9110 §1.4

Where does the HTTPS certificate-identity rule live now?

RFC 9110 §4.3.4 (using RFC 6125). It used to be in RFC 2818, which 9110 obsoletes. authority

What is the point of splitting "semantics" (9110) from "HTTP/1.1" (9112)?

Semantics — methods, status codes, fields, caching behaviour — are shared by HTTP/1.1, /2, and /3. Only the message framing differs. 9110 is the shared core; 9112 is now just the /1.1 wire format. RFC 9110 §2.5

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